66644844666 has 32 divisors (see below), whose sum is σ = 142843955328. Its totient is φ = 20674779840.

The previous prime is 66644844569. The next prime is 66644844743.

66644844666 is nontrivially palindromic in base 10.

66644844666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6521025 + ... + 6531236.

It is an arithmetic number, because the mean of its divisors is an integer number (4463873604).

Almost surely, 2^66644844666 is an apocalyptic number.

66644844666 is an abundant number, since it is smaller than the sum of its proper divisors (76199110662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66644844666 is a wasteful number, since it uses less digits than its factorization.

66644844666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13052326.

The product of its digits is 95551488, while the sum is 60.

The spelling of 66644844666 in words is "sixty-six billion, six hundred forty-four million, eight hundred forty-four thousand, six hundred sixty-six".